Protective device for mines.



J. W. REED. PROTECTIVE DEVICE FOR MINES. APPLIOAT ION FILED SEPT. 18,1912.

\ Patented June 10, 1913.

I VIZ V1? SS [55 J'QHN WILSON REED, F CEDAR GROVE, 'WTST "JIQRGERIZLPROTECTIVE DEVICE FOR IIZINES.

1 64 ,378,, Specification o Application filed September 1e,

To all whom, it may concern Be it known that 1', JOHN W. REE-n, citizenof the United States, residing at Cedar Grove. in the county or Kanawhaand State of Vi est Virginia, have invented a new and useful Improvementin Protective Devices for Mines, of which the following is aspecification.

This invention relates to an alarm device especially adapted for use inmines, tuir nels, and all excavating Work in which a more or lessunstable roof left.

The object of'thc invention is to give an audible alarm to the miners orworkmen upon any movement in said root even in case such movementshouldbe merely a slow settling of the roof, unaccompanied. by any cracking orother noise which would give warning to the workmen oi the unsafecondition of the root.

In order to obtain. the object of the invention I employ a post adapt 3.to he rested upon the ground or floor, and extending nearly to the roof.A sleeve carried by this post in which placed a coil spring. and a plateis held against the roof by said epring and suitable alarm devices areso arranged that movement of the spri coils due to pressure oi the earthor root or the excavation or mine will cause an ltltll'lll to he given.

In Figure 1 have vice in position for u in elevation, and parts in Fig.2 is a section on the line c 1. Fig.3 is an inverted plan ew or :1. topplate.

In these draivin 1:, l .L'EKIQSP. of the mine or tunnel. and to he setvertically the eiu. ii of the post carries a sleeve 3, vided with aninterior head t serves to limit movement the sleeve over the postandalso forms a 511")0il) for it suiluhlc-lowcrplate Secured t a coilsprii'ig 5. which loosely upwarl'lly tor-one d normally pro ects: filthe sleeve. At its upper end the spring carries 1? Letters Eeteut.

Patented June Mi EH3.

Serial names.

a .top plate 7, which is forced against the roof 1 by the spring (5.SuitablebellsB are carried by the sleeve 3, said bells being; arrangedat different points upon the exterior of the sleeve and in differenthorizontal planes. The inner end of the hell cleppers 9 are suitablypivotally mounted in openings 10 in the sleeve 3 and the inner ends ofthe clappers extend into the path of the coils of the spring as shown inthe drawin It will be obvious that downward movement of the plate 7 dueto any settling of the roof will eoinpress the spring, causing the coil?to move downwardly and such movement will rock the slappers 9 upon theirpivotal points and then release them fine hell could e employed but byarranging two hells at different points the device is made moresensitive to slight disturbances.

The spring (3 has its upper and lower ends suitably secured in eyes 11punched respectively from the plates 5 and '2'.

What I claim is:

1.. A device of the kind described cornprielng a suitable support avertically an ranged and normally extended coil spring carried by saidsupport, roof en iming means carried by the upper en-z of the saidspring", and alarm sounding cievices arran ed ud icent said spring andadapted to and actuated by closing n1ove- 'ie coils of said spring. "(reof the kind described co1nmet, a sleeve carried by the upper e postcoil. spring loosely arin the sleeve and projecting above eeve. a olatecerrf .(l the top of the g and normally in n ment with a rum, and alarmbells carrieo by the sleeve, the hell rlappr, extending inwardly betweenthe coils of the spring.

3. .i alnrin device of the hind deucrihed mnrgn .lng a verticallyarranged post, a l adapted lit over the upper end of the downwardmovement is continued.

M Leeageve said sleeve and resting upon said been a the coils of thespring when the same are 0011 spring mounted upon semi plate em;compressed.

projecting above the sleeve, a second plate carried by the projectingend of the spring N WILSON REED and adapted to engage a roof, and bellsear- 1 Witnesses:

ried by the sleeve, the bell cieppers extend- JOHN H. Dmqne e,

ing inwardly in position to be engaged by HENRY SMITH.

